Abstract
This paper discusses the influence of Vietnam rare earth (RE) with the composition of 69.4% Ce and 30.5% La (modification content of 4% and 6%) on the microstructure and mechanical properties of Al–5Zn–3.5Mg–1.2Cu alloy when the temperature modification is changed at [Formula: see text] in 150, 200, 250 s. By optical microscopy, the results showed that the microstructure of the modified sample is finer than the nonmodified sample. By the SEM and EDS analysis, at the grain boundaries of this alloy, [Formula: see text] and/or [Formula: see text] intermetallic phases appeared. The modified elements (La, Ce) in RE and aluminum were formed in the intermetallic [Formula: see text] and [Formula: see text] phases, which prevents the development of the dendritic [Formula: see text] phase. The result showed Al–5Zn–3.5Mg–1.2Cu alloy modified with 4% RE in 150 s which is the most optimal result, the grain size is [Formula: see text] and the hardness is 107 HB.
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